Fireproof and antirotting composition



.Patented, a... 26, 192s.

PATENT OFFICE.

TAISAN SHIGA, OFTOKYO, JAPAN.

FIREPBOOF AND ANTIROTTING COMPOSITIONJ No Drawing; fipplication'filedNovember 1, V1926, Serial at. 145,593, and in Japan July 17, 192a My invention relates to a fireproof and slightly acld solution of magnesiumborate, ammonium sulphate and sodium cresate, and has for its object toprovide an agent adapted to'impregnate timbers, papers, woven goods andthe like, and the artlcles made, therefrom, to render them fireproof andtion for along time.

A further object of my invention is to obtain a composition whichcontains the said three agents, by first making ammonium sulphate andmagnesium borate without using either borax or ammonium sulphate, 'butby means of a special process disclosed here after, and then byaddingacetic acid and sodium cresate to the mixed solution.

It is well known that magnesium borate and ammonium-sulphate have, aremarkable fireproof power, and that sodium cresate has a remarkableanti-rotting power, buttill now a composition consisting of the abovethree agents has never been used for fireproofing and anti-rottingpurposes;

In case magnesium borate is to be used as a fireproof agent, a mixtureof a'solution of borax and a solution of magnesium sulphate has usuallybeen used hitherto. This mixture practically consists of magnesiumborate and sodium sulphate, and produces a crystalline precipitate ofmagnesium borate, readily upon the application of heat, and afterseveral hours even in the cold state, so that practically it isimpossible to use the mixture; and not only that, but the mixture hasalso the defect that a large quantity of unnecessary sodiumsulphate iscontained in it.

My rocess consists in first making a mixture o ammonium sulphate andmagnesium hydroxide by adding ammonia Water to a solution of themagnesium sulphate, and then converting magnesium hydroxide thusproduced into magnesium borate by adding a solution of boric acid to thesaid mixture.

Thus a mixture of ammonium sulphate and magnesium borate,.which containsno other unnecessary materials, such as sodium sulphate, is obtainedfrom the above three chem- 1cals: viz, magnesium sulphate, ammonia waterand boric acid. This is the first special feature in my invention.

The mixture contains at first magnesium borate in theprecipitatedcondition, but it is changed into a clear solution ondissolving sulphate and Sodium cresate.

' of 15% solution of sodium cresate.

always acid, so that sodium cresate is easily the precipitate byadding asomewhat large quantity of boric acid and a little acetic acid to it.This is the second special feature of my invention. I Sodium cresate isthen'addedto the mixture; which should remain clear by keeping it alwaysslightly acid by. the addition of. acetic acid. This is the thirdspecial' feature of my invention. v

It will be seen that the composition thus prepared according to myinvention acts very efiiciently both as a fireproof andanti-rottingagent, as it containsfthe three necessary ingredients ofmagnesium borate, ammonium The quantities of each ingredient in"mycomposition may be varied advantageously according to whether themixture is tobe used for fireproofi'ng or anti-rot, and fur.

ther according to the nature of the material 7 to which the mixture isto be applied, For example, 100 p' rts by weight of a solution ofmagnesium 7 sulphate dissolved in two times its weight of water aremixed with 45 parts by weightof 10% ammonia water and stirred, and"after setting aside for,several hours, 12 parts by weight 'of asolution of boric acid dissolved in 9 6 parts by weight of water isaddedr'to the mixture .and stirred,

andthen 40 parts by weight ofdilute acetic 8 acid "(glacial acetic aciddissolved in four timesits weight of water) is added to it and then isslowly mixed-with 40 parts by Weight If boric acid is added in excess,the addition of acetic acid may be omitted. Instead of acetic acid,other acids or acid salts, having more or less fireproofing propertiesmay be used, the essential point is that the mixture must be keptdissolved. Instead of sodium cresate cresate may be used just'as well.

In applying the above composition for practical use, it may be coated onthe material or the article, or the latter may be soaked 100 in it, orit may be put into an impregnating can, which contains the mixture andis evacuated and moreover a certain pressure may be applied in addition.

The material or the article treated as 1 above described remains quiteunchanged on touching with a flame, and does not practically burn by anymeans, even if it is placed in the flame for a long time, except thatonly the surface of the portion touched by the 110 flame becomesslightly lolack and accordingly is in no danger of fire, and also doesnot rot for a long time. Having now particularly described and aslcertained the nature of the said invention,

and in What manner the same is to be performed, I declare that What Iclaim is:

The process of preparing a fireproofing and anti-rotting solution whichcomprises adding ammonia water to a solution of magnesiumsulphate,mixing the resulting solu-' tion with asolution of bogic acid and addingacetic acid and sodium cresate thereto. 1

In testimony whereof I aflix my signature.

' TAISAN SHIGA.

